Where is Your tax return

You only amend if you need to change something on an accepted original return and the IRS is done processing it and has sent you the first refund.  How to amend 2019

https://ttlc.intuit.com/community/tax-topics/help/how-do-i-amend-a-2019-return-in-turbotax/00/1238456 

What is your question?  You seemed to ask 2.  Where is your return?  And how to amend.  Can't you find your 2019 return?  It's common to end up with multiple accounts. First LOG OUT of whatever TurboTax account you're logged into right now. Then use this TurboTax account recovery website to get a list of user ID's for an email address. Run the tool against any email addresses you may have used
https://myturbotax.intuit.com/account-recovery/

If you used the Desktop CD/Download program then the only copy is on your computer and not saved or stored online.

You can also request a transcript from the IRS
https://www.irs.gov/individuals/get-transcript